Electrical apparatus



J. J. FRANK.

ELECTRICAL APPARATUS.

APPLICATION FILED oEc.10.1919.

1,41 1,61 9, Patented Apr. 4, 1922.

2 SHEETS-SHEET I.

Inventor: John JFrank byWM H i s Attorney.

J. J. FRANK.

'ELEGTRICAL APPARATUS. APPLICATION FILED 05010.1919.

1,411,619. Patented pr-4,1922.

2 SHEETS-SHEET 2.

Inventor": John JFrank,

Hi s Attorney.

TWUNITED STATES PATENT OFFICE.

JOHNJ. FRANK, OF IPI ITSFIELI), MASSACHUSETTS, ASSIGNOR TOGENERALELECTRIC COMPANY, A CORPORATIOIV OF NEW YORK.

nnnc'rnrcan insur s.

Specification of Letters Patent: Patented Apr. 4; 1922- Applicationfiled DecemberjlO, i919. Serial 1v6(343,9e0.

, fication.

, .My invention relates to electrical apparatus, 1 and particularly totransformers, some r'eactances and the like." The object of my inventionis to provide an improved ar- 3 rangementof windlngs alfordmg 1ncombination better support, ventilation and magnetic balance than hasbeen heretofore provided. v v l I; accomplishing my nvention I make usei J o'f'a'novel arrangementof supports for thelwindings and employ thenovel manner ofmaking connections between parts of the windings asishereinafter set forth more fully in detail.

For a more complete understanding. of the nature and objects of myinvention ref erence should be had to the following detaileddescriptiontaken in connection with the accompanying drawings in which:

Figure 1 shows in side elevation an arrangement of windings on atransformer embodying my invention. Fig. 2 is a perspective view showinga detail in the mode of connecting the windings according to myinvention. Fig. 3 is a top plan view showing the arrangement forsupporting the coils shown in Fig. 2. Figs. 4, 5 and 6 are views similarto Fig. 3l-showing modifications.

Referring now to the drawings, 10 represents a magnetic core whosecentral leg supports the winding 11, of the interleaved disccoil type.

The disc-c0ils 12 are wound on polygonal forms to give the contourshown, or they may be wound directly on the insulating cylinder 13 whichsurrounds the central leg of the core 10. When winding directly on thecylinder 13, the insulating devices, here shown as strips 14, which areequidistant-1y spaced about the cylindrical surface and are employed tosupport the coilsin proper assembly, are used in the first instance aswinding forms.

It is observed that the coils 12 so assembled about the cylinder 13,bear upon and are supported tangentially between the strips 14 by thecylindrical surface. Ventilatingducts for admitting the circulation coolng medium, as oil or air forinstance, are thus provided between thecoils 12 and the cylinder 13 at each sideof strips 14.

In disc-coil ,windings designed to carry relatively large currents, itis desirable to construct the coilsso that the'turns'c'omprise apluralitylof strands in parallel in order to'insure that'eac'h part ofthe turn shall carry its proper proportion of the current. Each turn inthe coils 12 shown in Figs' 2 and 3 comprises four such strandsindicatedrespectively at 15, '16, 17 and 18. In order, therefore, tobalance the magnetic side thrust occasioned atthe point where thecross-over is brought out to 0 from one'coilto another, I haveheredivided the strands into groups, groupsof twobeing shown in'Fig. 2,and bring out'such groups at 'a' plurality of symmetrically relatedpoints about the circumference ofthe coil. In Figs'fi2 andi 3 the groupsare brought out at diametrically opposite points'20 and21 in thecircumference of the coils. In this manner the magnetic thrusts at thecrossovers on the outer circumference of the coils are balanced. Theordinary radial spacing strips for spacing the coils from each other orfrom insulating collars between the coils are shown at 19 in Fig. 3.

In Fig. 1 I have shown a coil of substantially similar form to thatshown in Fig. 3, but instead of making the interior cross-over betweencoils at butone point as was indicated where the strands were shown at15, 16, 17, 18, this inner cross-over, is likewise made in amagnetically balanced manner. Accordingly the four strands are heredivided into groups at equally spaced points about the innercircumference or periphery as at 30 and 31.

In Fig. 5, I have shown a coil in which the turn in composed of sixstrands. This lends Similarly I have shown in Fig. 6 a coil'.

having a turn composed of eight strands, divided into four groups 50,51, 52 and 53 which are brought out at four equidistantly spaced pointsin orderto balance the magnetic forces about them.

A trans-former, or like induction apparatus, when built in accordancewith my invention is accordingly relieved of a great amount of sidethrust upon the coils, due to the balanced arrangement for makingcrossovers. Mioreover the coils themselves have a very rugged supportdue to the tangential bearing of the turns on the inner insulatingcylinder so that they are particularly able to stand side thrusts andyet have ample interior ventilating capacity. My invention isconsequently specially adapted to withstand hard service whereshort-circuits and the like fre uently occur.

I aving now described what is at present the best means known to me forcarrying out an embodiment of my invention, would have it understoodthat such means are merely illustrative and that I do not mean to. belimited thereby to the exact details shown nor in the choice ofrecognized equivalents except as defined in my claims hereunto appended.

\Vhat I claimas new and desire to secure c by Letters Patent of theUnited States, is

1. In an electrical apparatus, the combination with a Winding composedof stranded turns adapted to be connected in parallel, of an insulatingsupporting surface on which said winding bears tangentially at aplurality of points, said winding having its strands grouped and led oilat equidistantly spaced points to provide magnetically balancedcross-over connections.

2. In an electrical apparatus, a winding composed of stranded disc-coilshaving their strands parallel connected and grouped and led off. inequal numbers at equidistantly spaced points about the peripheries ofsaid disc-coils to form magnetically balanced cross-over connectionsbetween coils.

8. In an electrical apparatus, the combination with a winding composedof disc-coils generally polygonal in form, of a supporting insulatingcylinder, and spacing devices inserted between said coils and saidcylinder at the vertices of the polygon in such Wise as to hold saidcoils in place and to permit the inner turn to bear tangentially uponsaid cylinder.

4;. In an electrical apparatus, the combination with a magnetic core,ofan insulatin cylinder surrounding a leg of the same, an strandedpolygonal disccoil windings mounted about said cylinder and bearingtangentially thereupon, said windings having their strands connected inparallel, grouped and led off in equal numbers at a plurality ofequidistantly spaced points about a periphery thereofto providemagnetically balanced cross-over connections.

In witness whereof, I have hereunto set my hand this 5th day of Dec.,1919.

JOHN J. FRANK.

